Antibiotic effect of exogenously applied salicylic acid on in vitro soilborne pathogen, Fusarium oxysporum f.sp.niveum.
Salicylic acid, which is biosynthesized inside plant and is often found and accumulated in soil due to plant debris decaying, is considered as a signaling substance during plant-microbe interactions. It is involved in the cycling of biogeochemistry and related to plant resistance to biotic and abiotic stress. The antibiotic effect of salicylic acid on Fusarium oxysporum f.sp.niveum (FON) was studied to investigate the relationships between the salicylic acid and the fungus in the ecological interaction of plant-microbe. Results showed that the biomass, colony diameter, number of conidium germination and conidium production of FON were decreased by 52.0%, 25.7%, 100% and 100% at concentrations of 800 mg L(-1). However, mycotoxin yield was increased by 233%, pectinase activity raised by 168.0% and cellulase activity increased by 1325% compared to control at higher concentrations. It was concluded that salicylic acid as an allelochemical greatly inhibited FON growth and conidia formation and germination, though stimulated mycotoxin production and activities of hydrolytic enzymes by FON.
Wu
Hong-Sheng
HS
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, China.
Raza
Waseem
W
Fan
Jia-Qin
JQ
Sun
Yong-Gang
YG
Bao
Wei
W
Liu
Dong-Yang
DY
Huang
Qi-Wei
QW
Mao
Ze-Sheng
ZS
Shen
Qi-Rong
QR
Miao
Wei-Guo
WG
D005670:Fusarium / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology; D009183:Mycotoxins / Q000378:metabolism; D020156:Salicylic Acid / Q000494:pharmacology*; D012988:Soil Microbiology; D013172:Spores, Fungal / Q000187:drug effects / Q000502:physiology
D009183:Mycotoxins; D020156:Salicylic Acid